X=?
1. |X-5|=10
2. |X|-5=10
My answer: C
An= 4An-1 +3, A3=X, A1=?
My answer : (X-15)/16
50 pounds 岩石中 5% 为金属, ten times as much sliver as gold, gold=?
因为谁是谁的几倍 我每次都会弄混 所以不写答案了
2005-09 碰到的jj有
68,111,118,129,130,132
不过130那提我印象中我的条件一好像是众数等于平均数
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